Early Blind Flying Instruments - Identify?
 

In an associated thread on this forum I recently came across these photos of a Bernard 191, a French 15 seat airliner from the late '20s, this particular one the 'Oiseau Canari' which made the first French Atlantic crossing in 1929. It resides in the museum at LeBourget.
I am particularly intrigued by the two large instruments either side of the wheel which are clearly blind-flying aids of some sort. The
Anyone have knowlege of how they worked and how they were used? They date concurrenbtly with Doolittle's first experiments in blind landings but seem far less sophsiticated than his electrical kit.
You can access the original panoramic view here.
https://www.museeairespace.fr/aller-...oiseau-canari/


https://cimg1.ibsrv.net/gimg/pprune....9e0d1bb7ae.png
https://cimg5.ibsrv.net/gimg/pprune....7ff042428f.png